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Where It All Began

The advent of IO games can be traced back to the one game that started it all: Agar.io. In it, you eat, and you grow, and you eat some more, and you grow some more, consuming anything that’s smaller than you, including players. It’s a lot like another similar game, Osmos, only Agar.io was free, and multiplayer. You joined a room with dozens of other players who were all trying to grow, and eat, and consume each other in an effort to become the biggest blob possible. If you died, you had to start all over. The game became wildly popular, and it has now spawned hundreds of other IO games, some are quite similar to Agar.io, some aren’t, but they all follow a similar format. They’re all free, and they’re all multiplayer.

What’s in a Name?

Most IO games follower a similar set of principles (although there are a few that break from this mold) but in general, expect an IO game to be:

Quick to play – You can jump at the click of a button and get to playing within seconds. They’re all browser-based, and have minimal download sizes. In a lot of ways, they can be considered an evolution over the flash games of yore.

Easy to learn, hard to master – Typically, IO games can all be easily grasped within a few seconds of playing, or a few seconds of reading a tutorial. But mastering them can take a fair amount of practice (and countless deaths from players who are exponentially more powerful than you).

RPG Elements – Most of them are RPGs, at least in a broad sense of the word. There’s progression, and typically there isn’t any sort of cap. In Agar.io, you can grow until you cover the entire map as an all-encompassing blob. Other games allow you to upgrade or level up specific stats, such as damage or health. A lot of what makes them so addictive and fun is that satisfaction that comes from utterly dominating other players as you become ridiculously power. However, there is a subset of IO games that have less in the way of progression, and are all about twitch reflexes and skill.

Multiplayer – Most of them are competitive, and entirely free-for-all. It’s a blob-eat-blob world, in the case of Agar.io. Other games can be cooperative, or at least team-based. But generally, they’re all multiplayer, and they all involve defeating other players as you grow immensely powerful in the process.

Making Sense of It

As Agar.io’s popularity grew, IO games began to pop up every few days, especially since many of them were so simplistic in nature. It quickly became difficult to keep track of every IO game out there. That’s why this site was created: To give intrepid IO game players a place to sift through all that’s available and find the next one they want to devote an afternoon getting lost in.

Each game’s profile will have a short description to give you a good idea of what’s in store if you choose to play it, the controls and how the game is generally played, as well as a few tips or strategy to give you an edge over your opponents. You’re also able to vote on any of the games to let other players know just how fun (or unfun) it is.

If we’re missing any IO games, or if any of the games are no longer available, feel free to drop us a line, and we’ll be sure to include it in the directory.